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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  Random Number Generator Top                                 ////

////                                                              ////

////  This file is part of the SystemC RNG project                ////

////                                                              ////

////  Description:                                                ////

////  Top file of random number generator                         ////

////                                                              ////

////  To Do:                                                      ////

////   - nothing                                                  ////

////                                                              ////

////  Author(s):                                                  ////

////      - Javier Castillo, jcastilo@opencores.org               ////

////                                                              ////

////  This core is provided by OpenSoc                            ////

////  http://www.opensocdesign.com                                ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source is distributed in the hope that it will be       ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

//// PURPOSE.  See the GNU Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// Revision 1.2  2004/08/30 17:01:50  jcastillo

// Used indent command

//

// Revision 1.1.1.1  2004/08/19 14:27:14  jcastillo

// First import

//

#include "rng.h"

void

rng::combinate ()

{

  if (!reset.read ())

    {

      number_o.write (0);

    }

  else

    {

      number_o.write (LFSR_reg.read ().range (31, 0) ^ CASR_reg.read ().range (31, 0));

    }

}

void

rng::LFSR ()

{

  sc_uint < 43 > LFSR_var;

  bool outbit;

  if (!reset.read ())

    {

      LFSR_reg.write (1);

    }

  else

    {

      if (loadseed_i.read ())

        {

          LFSR_var.range (42, 31) = 0;

          LFSR_var.range (31, 0) = seed_i.read ();

          LFSR_reg.write (LFSR_var);

        }

      else

        {

          LFSR_var = LFSR_reg.read ();

          outbit = LFSR_var[42];

          LFSR_var[42] = LFSR_var[41];

          LFSR_var[41] = LFSR_var[40] ^ outbit;

          LFSR_var[40] = LFSR_var[39];

          LFSR_var[39] = LFSR_var[38];

          LFSR_var[38] = LFSR_var[37];

          LFSR_var[37] = LFSR_var[36];

          LFSR_var[36] = LFSR_var[35];

          LFSR_var[35] = LFSR_var[34];

          LFSR_var[34] = LFSR_var[33];

          LFSR_var[33] = LFSR_var[32];

          LFSR_var[32] = LFSR_var[31];

          LFSR_var[31] = LFSR_var[30];

          LFSR_var[30] = LFSR_var[29];

          LFSR_var[29] = LFSR_var[28];

          LFSR_var[28] = LFSR_var[27];

          LFSR_var[27] = LFSR_var[26];

          LFSR_var[26] = LFSR_var[25];

          LFSR_var[25] = LFSR_var[24];

          LFSR_var[24] = LFSR_var[23];

          LFSR_var[23] = LFSR_var[22];

          LFSR_var[22] = LFSR_var[21];

          LFSR_var[21] = LFSR_var[20];

          LFSR_var[20] = LFSR_var[19] ^ outbit;

          LFSR_var[19] = LFSR_var[18];

          LFSR_var[18] = LFSR_var[17];

          LFSR_var[17] = LFSR_var[16];

          LFSR_var[16] = LFSR_var[15];

          LFSR_var[15] = LFSR_var[14];

          LFSR_var[14] = LFSR_var[13];

          LFSR_var[13] = LFSR_var[12];

          LFSR_var[12] = LFSR_var[11];

          LFSR_var[11] = LFSR_var[10];

          LFSR_var[10] = LFSR_var[9];

          LFSR_var[9] = LFSR_var[8];

          LFSR_var[8] = LFSR_var[7];

          LFSR_var[7] = LFSR_var[6];

          LFSR_var[6] = LFSR_var[5];

          LFSR_var[5] = LFSR_var[4];

          LFSR_var[4] = LFSR_var[3];

          LFSR_var[3] = LFSR_var[2];

          LFSR_var[2] = LFSR_var[1];

          LFSR_var[1] = LFSR_var[0] ^ outbit;

          LFSR_var[0] = LFSR_var[42];

          LFSR_reg.write (LFSR_var);

        }

    }

}

void

rng::CASR ()

{

  sc_uint < 43 > CASR_var, CASR_out;

  if (!reset.read ())

    {

      CASR_reg.write (1);

    }

  else

    {

      if (loadseed_i.read ())

        {

          CASR_var.range (36, 31) = 0;

          CASR_var.range (31, 0) = seed_i.read ();

          CASR_reg.write (CASR_var);

        }

      else

        {

          CASR_var = CASR_reg.read ();

          CASR_out[36] = CASR_var[35] ^ CASR_var[0];

          CASR_out[35] = CASR_var[34] ^ CASR_var[36];

          CASR_out[34] = CASR_var[33] ^ CASR_var[35];

          CASR_out[33] = CASR_var[32] ^ CASR_var[34];

          CASR_out[32] = CASR_var[31] ^ CASR_var[33];

          CASR_out[31] = CASR_var[30] ^ CASR_var[32];

          CASR_out[30] = CASR_var[29] ^ CASR_var[31];

          CASR_out[29] = CASR_var[28] ^ CASR_var[30];

          CASR_out[28] = CASR_var[27] ^ CASR_var[29];

          CASR_out[27] = CASR_var[26] ^ CASR_var[28];

          CASR_out[26] = CASR_var[25] ^ CASR_var[27];

          CASR_out[25] = CASR_var[24] ^ CASR_var[26];

          CASR_out[24] = CASR_var[23] ^ CASR_var[25];

          CASR_out[23] = CASR_var[22] ^ CASR_var[24];

          CASR_out[22] = CASR_var[21] ^ CASR_var[23];

          CASR_out[21] = CASR_var[20] ^ CASR_var[22];

          CASR_out[20] = CASR_var[19] ^ CASR_var[21];

          CASR_out[19] = CASR_var[18] ^ CASR_var[20];

          CASR_out[18] = CASR_var[17] ^ CASR_var[19];

          CASR_out[17] = CASR_var[16] ^ CASR_var[18];

          CASR_out[16] = CASR_var[15] ^ CASR_var[17];

          CASR_out[15] = CASR_var[14] ^ CASR_var[16];

          CASR_out[14] = CASR_var[13] ^ CASR_var[15];

          CASR_out[13] = CASR_var[12] ^ CASR_var[14];

          CASR_out[12] = CASR_var[11] ^ CASR_var[13];

          CASR_out[11] = CASR_var[10] ^ CASR_var[12];

          CASR_out[10] = CASR_var[9] ^ CASR_var[11];

          CASR_out[9] = CASR_var[8] ^ CASR_var[10];

          CASR_out[8] = CASR_var[7] ^ CASR_var[9];

          CASR_out[7] = CASR_var[6] ^ CASR_var[8];

          CASR_out[6] = CASR_var[5] ^ CASR_var[7];

          CASR_out[5] = CASR_var[4] ^ CASR_var[6];

          CASR_out[4] = CASR_var[3] ^ CASR_var[5];

          CASR_out[3] = CASR_var[2] ^ CASR_var[4];

          CASR_out[2] = CASR_var[1] ^ CASR_var[3];

          CASR_out[1] = CASR_var[0] ^ CASR_var[2];

          CASR_out[0] = CASR_var[36] ^ CASR_var[1];

          CASR_reg.write (CASR_out);

        }

    }

}